After reading a thread where a shooter's barrel rebored barrel blew up on the first shot with factory ammunition, and it was a barrel that had been rebored from 30-06 to 35 Whelen, I became leery of reboring. I did weigh a F34 contour barrel in 30-06 and 35 Whelen, these were barrels from Midway, and the 35 Whelen was three ounces lighter than the 30-06. A barrel is the most important pressure vessel in the system, it carries almost all of the cartridge pressure, the locking lugs carry very little compared with the barrel. And barrel were not meant to be reused. No one makes the things under the assumption that once the original service life is over, that material can be removed, (weakening the thing) making the old barrel serviceable for another lifetime of shooting. (No one makes tires under the assumption they will be re treaded, and just look at all the tire debris on the road!) It is just safer to buy a new barrel. However, most hunting rifles have less than 100 rounds through them, so maybe reboring a like new barrel is not so risky. But, I don't know if the material and heat treat are any different between calibers, I doubt they are for small arms, but I don't know. I would not rebore a barrel with worn rifling.